Evaluation of the Degradation of Fiber Composites by Integrated Structural Health Monitoring

通过综合结构健康监测评估纤维复合材料的降解

• 批准号: 246293183
• 负责人: Professor Dr.-Ing. Rolf Lammering
• 金额: --
• 依托单位: Professur für Mechanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/246293183?language=en
• 关键词: Evaluation; Degradation; Fiber; Composites; Integrated

The degradation of fiber-reinforced polymers due to cyclic loading is associated with micro defects in the material. Within this project, the implications of micro defects on the propagation of Lamb waves will be investigated. The first objective is to capture qualitatively the effects of micro defects, which are characteristic for fiber-reinforced plastics but not relevant to immediate failure, and the related material degradation on the characteristic properties of Lamb waves. The experimental investigations will analyze the degradation influence on characteristic parameters of the linear wave theory, such as the group velocity, and include the non-linear defect behavior, which is caused e.g. by the interaction of crack surfaces and which may be described by the acoustic nonlinear parameter. It is assumed that reference measurements from undamaged specimens have to be available. The second, far-reaching objective aims at the quantification of these effects. The related experiments address the question whether the extent of the degradation and thus the extent of the damage can be assessed by changes of those parameters, which describe the propagation behavior of Lamb waves.

纤维增强聚合物在循环载荷作用下的降解与材料中的微缺陷有关。在这个项目中，微缺陷对兰姆波传播的影响将被研究。第一个目标是定性地捕捉微缺陷的影响，这是纤维增强塑料的特征，但与立即失效无关，以及相关材料降解对兰姆波特征特性的影响。实验研究将分析退化对线性波理论特征参数（如群速度）的影响，并包括由裂纹表面相互作用引起的非线性缺陷行为，这些缺陷行为可以用声学非线性参数来描述。假定必须提供未损坏标本的参考测量值。第二个意义深远的目标旨在量化这些影响。相关的实验解决了是否退化的程度，从而损害的程度可以通过这些参数的变化来评估的问题，这些参数描述兰姆波的传播行为。

项目成果

Numerical simulation of elastic wave propagation in isotropic media considering material and geometrical nonlinearities

• DOI: 10.1088/0964-1726/24/4/045027
• 发表时间: 2015-04
• 期刊: Smart Materials and Structures
• 影响因子: 4.1
• 作者: N. Rauter;R. Lammering

A constitutive model for the analysis of second harmonic Lamb waves in unidirectional composites

• DOI: 10.1016/j.ijsolstr.2017.11.019
• 发表时间: 2017-11
• 期刊: International Journal of Solids and Structures
• 影响因子: 3.6
• 作者: N. Rauter;R. Lammering

Impact Damage Detection in Composite Structures Considering Nonlinear Lamb Wave Propagation

• DOI: 10.1080/15376494.2014.907950
• 发表时间: 2015-01-01
• 期刊: MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
• 影响因子: 2.8
• 作者: Rauter, Natalie;Lammering, Rolf
• 通讯作者: Lammering, Rolf

On the detection of fatigue damage in composites by use of second harmonic guided waves

• DOI: 10.1016/j.compstruct.2016.05.049
• 发表时间: 2016-09-15
• 期刊: COMPOSITE STRUCTURES
• 影响因子: 6.3
• 作者: Rauter, Natalie;Lammering, Rolf;Kuehnrich, Tim
• 通讯作者: Kuehnrich, Tim